Improvement in making steam-tight joints



E. & J. BOURNE.

Making Steam Tight Joints. No. 40,991. Patented Dee. 22. 1863 STATES ATENT IMPROVEMENT IN MAKING STEAM-TIGHT JOINTS.

Specification foiming part of Letters Patent No. 40,99Ldated December 22, 1863.

To all whom it may concern Be it known that we, EDWARD BOURNE and JonN BOURNE, of the city of Pittsburg, in the county of Allegheny and Stateof Pennsylvania, have invented a new and useful Improvementin the Construction of Steam-Tight Seams in Radiators; and we hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, making part of this specification, and to the letters of reference marked thereon.

The nature ofour invention consists in forming a perfectly steam-tight joint or scam in sheet-iron radiators by inclosing a thin strip of wood in the seam formed by turning the edges of the sheets one over the other, in the manner represented in the perspective drawing, Figure 1.

To enable others skilled in the art to understand and make our invention, we will proceed to describe its construction by reference to the accompanying drawings.

We construct our radiators in any of the well-known forms and with all the usual appliances of such radiators but, in order to obviate the difficulties hitherto experienced in making the lap'joint or seam around the.

edge of the radiators perfectly stea-nrtight, we construct our radiators of thin sheet-iron plates, in the manner and for the purposes shown and described in the patent granted to us August 5,1862; but to make the seam around the edge perfectly steam-tight, the plates A and B, Fig. 1, are out so that the edge of one plate shall project about one-half inch around the entire plate beyond that of the other. The projecting edge of the largest plate is now turned up, or rather over, the edge of the smallest plate, when a thin strip of wood, 0, Fig. 2, is placed under the lap, which is now beat down upon the smallest plate. The lap so formed is then turned again, carrying with it the same width of the smallest sheet, thus interlocking the'edges of the two sheets together. The edges of the sheets being completely embedded in the wood 0 makes the seam perfectly steam-tight, and overcomes the difficulties hitherto experienced in forming steam-tight joints in radiators of this class.

WVe are aware that different elastic sub stancessuch as india-rubber, paper, pasteboard, canvas, strands of rope, twine, &;c. have been interposed between sheets ofmetal for the purpose of forming steam-tight joints; but inthe use of these substances great difficulty is experienced in getting the packing to lay, and when once in has no tendency to swell and insure the tightness of the joint when the steam comes in contact therewith. Therefore, we do not claim the use of either of these substances for forming the joints of steam-tight vessels; nor do we claim the use of wood interposed between sheets of metal other than those forming a radiator; neither do we claim a radiator formed of two flat sheets of metal having their edges secured together by a lap-joint; but

\Vhat we do claim is- As a new and improved article of manufacture, asteam-radiator formed of two flat sheets of metal having their edges united together by a lap-joint, when said joints are made steam-tight by the interposition of a strip of wood between the sheets before closing down the seam, substantially in the manner as herein set forth.

EDWARD BoUnNn. JOHN nounnn.

Witnesses:

J. W. has J AS. HOWELL. 

